Remember in all following exercises, when striking your board, do not think it is just a board but think it is your opponent or enemy, that means evil of this world. Keep your eye sharply on it and watch it as you strike. Right-handed person should always start with the left punch, with double exercise on the left punch to develop speed and strenght, same as the right, while left-handed person begin with the right, with double exercise on the right punch. When practicing your punching, if your punching speed about 10, be sure your returning speed is 13. That means your returning speed must be faster than your punching speed...
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